Digital data recording apparatus

摘要

There is provided a digital data recording apparatus, which can transmit a recording data via a rotary transformer without receiving an influence of a recording data rate and low frequency cut-off, and can perform high-quality digital recording with a simple configuration. The digital data recording apparatus includes: modulation means for modulating a recording clock by a recording data; reference level setting means for setting a reference voltage and a reference current in signal processing based on a reference clock having a multiple cycle of the cycle of the recording clock when the reference clock is supplied via the rotary transformer; demodulation means for obtaining a demodulation signal from a modulation signal when the modulation means supplies the modulation signal via the rotary transformer; recording signal generating means for generating a recording signal from the demodulation signal; and recording means for recording the recording signal on a recording medium. The demodulation means includes: signal forming means for obtaining a modulation signal and an inverted modulation signal from the modulation signal; first and second saw-tooth wave generators for obtaining first and second saw-tooth wave signals from the modulation signal and the inverted modulation signal when the reference current is supplied from the reference level setting means; and a mixer for mixing the first and second saw-tooth wave signals, and obtains the demodulation signal based on an output signal from the mixer and the reference voltage from the reference level setting means.